The time between a sneeze and the first person to say "bless you". There is usually one person in the crowd with a fast sneeze reaction time that starts off the "bless you" chain reaction where multiple people in the room all say bless the person for sneezing... for some reason.
Dave: "Ahh Chooo"
Matt: Bless you
4 more people: bless you
Dave: Damn Matt that was like a half second sneeze reaction, did you see it coming?
Matt: Nah, I'm just good.
by Mon-Star April 20, 2010
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When you get so broke from buying a beast gaming pc so you resort to making cringy youtube videos.
Lost soul: "Hey everybody this is Reaction W here, and today..."
Boomers: "Your generation is destroying our society."
by fat nigerian November 19, 2019
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of, pertaining to, marked by facial reaction caused by consumption of something a consumer finds distasteful. It is completely reactionary and cannot be simulated effectively.
Example 1:

Andre: My favorite drink is Vodka and Red Bull.

Steve: Vodka is nasty, I can't even drink it without getting reaction face.

Example 2:
"Jorge is such a douche, watch how he gets reaction face every time he takes a shot."
by l20B0T March 18, 2009
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The effect of one thing happening, only for other things, usually negative, to happen because of it.
Person 1: The baby woke up last night, so I lost sleep, so I was less productive, so I didn't get my project done, so my grade is shit, so I can't go to the concert tonight.
Person 2: Aw shit, you got hit by a Chain Reaction.
by In My Defense... September 28, 2018
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The reaction that occurs between CO2 (carbon dioxide) and sodium chloride (salt) when in H2O (water). The carbon dioxide bonds to the sodium chloride, creating a molecule significantly lighter than water, leading to swift evaporation of both the CO2 and sodium chloride.

The reaction was discovered by Professor Adwardo Vitenn in 1957
When I poured salt into my soda it caused the Vitenn reaction to occur between the CO2 and the salt
by sciencemajor January 2, 2019
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